I bought 1 of my i1Pros used on ebay for 350€ (this was more than 1 year ago before it's the successor was introduced) and saw a few other auctions ending at about 400€.I took a quick a look on ebay and the few i1Pros where either sold on the other side of the world or where already out of budget.
But as I said, if your priority is display profiling, I think it's a not a bad idea at all to buy an i1 Display Pro and add an other device for printer profiling later. Or to buy a colormunki (which may or may not meet your requirements in terms of profile quality and flexibility).
btw. why the heck does this forum censor the word "o_n_e"?! ))